natter/default_environment/stylesheet/main.css

:root {
  --main-max-width: 800px;
  --site-background-color: #0a0a0a;
  --site-text-color: #fffffc;
  --header-divider-color: #6a687a;

  --stream-divider-color: #6ccff6;
  --stream-post-background-color: #1f1f1f;

  --src-font-family: ui-monospace, "Cascadia Code", "Source Code Pro", Menlo,
    Consolas, "DejaVu Sans Mono", monospace;

  --src-block-background-color: #141414;
  --src-block-border-color: #84828f;
  --src-block-language-color: #0a0a0a;
  --src-block-language-background: #84828f;

  --quote-block-border-color: #84828f;

  --table-border-color: #6a687a;
  --table-odd-background-color: #0a0a0a;
  --table-even-background-color: #141414;
}

@media (prefers-color-scheme: light) {
  :root {
    --site-background-color: #f5f5f5;
    --site-text-color: #000003;
    --header-divider-color: #959785;

    --stream-divider-color: #933009;
    --stream-post-background-color: #e0e0e0;

    --src-block-background-color: #ebebeb;
    --src-block-border-color: #7b7d70;
    --src-block-language-color: #f5f5f5;
    --src-block-language-background: #7b7d70;

    --quote-block-border-color: #7b7d70;

    --table-border-color: #959785;
    --table-odd-background-color: #f5f5f5;
    --table-even-background-color: #ebebeb;
  }
}

body {
  color: var(--site-text-color);
  background-color: var(--site-background-color);
  font-family: source-sans-pro, Seravek, "Gill Sans Nova", Ubuntu, Calibri,
    "DejaVu Sans", sans-serif;

  a:link,
  a:visited {
    /* TODO: Should I use a different color for links? */
    color: var(--site-text-color);
  }
}

.page_centering {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.page_header {
  width: 100%;
  max-width: var(--main-max-width);
  border-bottom: 0.1rem solid var(--header-divider-color);

  .home_link {
    font-size: 1.2rem;
    font-weight: 600;
    text-decoration: none;

    &:link,
    &:visited {
      color: var(--site-text-color);
    }
  }
}

.main_content {
  width: 100%;
  max-width: var(--main-max-width);
  font-size: 1.2rem;
  line-height: 1.2;
  padding-bottom: 8rem;

  /* A stand-alone blog post (not in a blog stream). */
  .blog_post {
    padding: 1rem 0 3rem 0;
  }

  .blog_stream {
    .stream_divider {
      color: var(--stream-divider-color);
    }

    .stream_nav {
      display: flex;
      flex-direction: row;
      align-items: center;
      > a {
        display: inline-block;
        padding: 0.2rem 0.5rem;
        font-weight: 700;
        font-size: 1.5rem;
      }
      > .spacer {
        display: inline-block;
        flex: 1 1;
      }
    }
  }

  /* A blog post in a blog stream (for example, the homepage). */
  .blog_stream_post {
    background: var(--stream-post-background-color);
    padding: 1rem 0.2rem;
  }

  .blog_post_title {
    font-size: 2.5rem;
    font-weight: 700;
    padding-bottom: 1rem;
  }

  p {
    margin: 1rem 0;
  }

  .src_block {
    background: var(--src-block-background-color);
    border-radius: 3px;
    border: 1px solid var(--src-block-border-color);
    font-size: 1rem;
    font-family: var(--src-font-family);
    margin: 1rem 0;

    .src_language {
      display: inline-block;
      color: var(--src-block-language-color);
      background: var(--src-block-language-background);
      border-radius: 0 0 3px 0;
      padding: 0.1rem 0.5rem;
      font-size: 0.8rem;
      vertical-align: top;
    }

    .src_body {
      margin: 0.5rem;

      .src_line {
        white-space: pre-wrap;
      }
    }
  }

  .inline_source_block {
    font-family: var(--src-font-family);
    font-size: 1rem;
  }

  .code,
  .verbatim {
    font-family: var(--src-font-family);
    font-size: 1rem;
  }

  .quote_block {
    border-left: 1px solid var(--quote-block-border-color);
    padding: 0 0 0 1rem;
    margin: 1rem 0 1rem 2rem;
  }

  h2,
  h3 {
    margin: 1rem 0;
    padding-bottom: 0.5rem;
  }

  h2 {
    font-size: 2.3rem;
    font-weight: 600;
  }

  h3 {
    font-size: 2.1rem;
    font-weight: 600;
  }

  .plain_list {
    &.unordered {
      list-style-type: disc;
      padding-left: 2.5rem;
    }

    &.ordered {
      list-style-type: decimal;
      padding-left: 2.5rem;
    }

    &.descriptive {
      font-size: 1rem;
      > dt {
        font-weight: 600;
      }

      > dd {
        padding-left: 2.5rem;
      }
    }
  }

  .footnote_reference {
    vertical-align: super;
    font-size: 80%;
    > a {
      text-decoration: none;
    }
  }

  .footnote_definition {
    .label {
      text-decoration: none;
    }
    .definition {
      display: inline;

      > p {
        display: inline;
      }
    }
  }

  .org_table {
    table-layout: fixed;
    border-collapse: collapse;
    border: 1px solid var(--table-border-color);
    > tbody {
      border-width: 1px 0;
      border-style: solid;
      border-color: var(--table-border-color);
      > tr {
        > td {
          padding: 0.2rem;
        }
      }
      > tr:nth-child(odd) {
        background-color: var(--table-odd-background-color);
      }
      > tr:nth-child(even) {
        background-color: var(--table-even-background-color);
      }
    }
    > thead {
      border-width: 1px 0;
      border-style: solid;
      border-color: var(--table-border-color);
      > tr {
        > th {
          padding: 0.2rem;
          font-weight: 600;
        }
      }
    }
  }
}